Malicious PDF — malware analysis report

Static analysis result for SHA-256 15213f23da884289…

MALICIOUS

PDF

51.1 KB Created: 2020-07-22 17:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a690ab129dc08f284fe300208c94a7a1 SHA-1: c9d6c78b5f3ae06e4268afbff3c2d990e73bac41 SHA-256: 15213f23da884289ec38c6045f60d3789353df8492158f98ccf65b900f219aec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at "https://ttraff.com/pify?keyword=sap+blueprint+template+pdf". The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=sap+blueprint+template+pdf
    • http://files.fumigation-services.es/uploads/1/3/1/4/131407051/goderotorebawuduna.pdf
    • http://files.hopedreamtravel.com/uploads/1/3/1/3/131383383/2360385.pdf
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816158/252b1d3f634b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3123/2666/files/80940955139.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/nujedepikuxijaviranonoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3182/2485/files/58655582680.pdf
    • https://novebagi.files.wordpress.com/2020/06/56823489240.pdf
    • https://kekumob.files.wordpress.com/2020/07/batalevoxubojigezojifiza.pdf
    • https://warezofokel.files.wordpress.com/2020/07/xinegukinalaxiretojaligi.pdf
    • https://goberumig.files.wordpress.com/2020/07/41433532591.pdf
    • https://pezukiniv.files.wordpress.com/2020/07/vabiwuroxuxukawilejunami.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/53462132209.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/pubomuwulivejododaxorobot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93366398369.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/94505480130.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/62354160522.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/kewofepegan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a03.bin
3722336d451dd2528fe4bbdc25060d1da16377d024ffdb64b76871078937503f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A03 5024 bytes
font_01_sfnt_off00009ae9.bin
407ed58737b79c31576b52d35fd3dc09438a504b07c236a5ef9d7ad902bfdf8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE9 10724 bytes

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